Boyle, Robert
,
New experiments physico-mechanicall, touching the spring of the air and its effects
,
1660
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Stop-cock, there was ſpeedily apply'd a
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tapering Valve of braſs, ſuch as is deſcrib'd
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in the 9
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th
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fig: made fit to go with its nar
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rower end into the cavity of the branch,
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and to fill the orifice of that cavity with
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its broader part. </
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<
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>And that the Air might
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not get in at the litle intervals, left here
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and there between the convex ſurface of
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the ſtopple and the internall edge of the
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branch, thoſe intervals were ſtop't with
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a little Diachylon. </
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<
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>And to the doore,
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or, (if you pleaſe) that part of the Valve
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which was to move to and fro, and in
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this Experiment hung perpendicular to
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the Horizon, there was, at a button of
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braſs belonging to the Valve faſten'd a
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broad ſcale wherein weights were to be
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put. </
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>This done the key of the Stop-cock
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was turn'd, and the externall Air beating
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like a forcible ſtreame upon the Valve
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to get in there, it did ſuddenly both ſhut
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the Valve and keep it ſhut ſo ſtrongly,
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that we had time to caſt in diverſe weights
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one after another into the Scale; till at
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length the weight overpowering the preſ
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ſure of the Atmoſphere, drew downe the
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Valve by the ſtringes that ty'd the Scale
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to it, and gave liberty to the outward Air
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to ruſh into the Receiver. </
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<
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